Tunnel surrounding rock classification forecast based on the geological advanced prediction system in seismic area

The global earthquake disaster happened frequently in recent years, how to guide the construction correctly in seismic area becoming a problem to be solved, while the study on the tunnel geological advanced prediction system in seismic area is limited. This paper established an integrated prediction system which was combined with engineering geology analysis and geophysical method combined with the analysis of the characters and reasons of tunnel disaster in seismic area. And then, based on the forecast results, the interval of the groundwater correction factor K1, main strike-dip of structural surfaces correction factor K2, the initial stress state influence correction factor K3, which affected basic quality indicator of surrounding rock BQ were divided. At last, the dynamic division of tunnel surrounding rock classification was made by using of comprehensive evaluation method of surrounding rock classification. Construction feedback information showed that the forecast results were accurate and it played a good role to guide the tunnel construction.